function createElement(tagName, attributes) {
    const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
    var item = document.createElementNS(XUL_NS, tagName);
    var attrs = attributes.split("|");

    for (i=0;i<attrs.length;i++) {
        attr = attrs[i].split("=");
        item.setAttribute(attr[0], attr[1]);
    }

    return item;
}

function onMenuItemCommand(event) {
    toggleSidebar('viewSidebar');

    //javascript:(function(){var%20s=document.createElement('div');s.innerHTML='Loading...';s.style.color='black';s.style.padding='20px';s.style.position='fixed';s.style.zIndex='9999';s.style.fontSize='3.0em';s.style.border='2px%20solid%20black';s.style.right='40px';s.style.top='40px';s.setAttribute('class','selector_gadget_loading');s.style.background='white';document.body.appendChild(s);s=document.createElement('script');s.setAttribute('type','text/javascript');s.setAttribute('src','http://www.selectorgadget.com/stable/lib/selectorgadget.js?raw=true');document.body.appendChild(s);})();
}